code: def b64encode(s, altchars=None):
      """Encode the bytes-like object s using Base64 and return a bytes object.
  
      Optional altchars should be a byte string of length 2 which specifies an
      alternative alphabet for the '+' and '/' characters.  This allows an
      application to e.g. generate url or filesystem safe Base64 strings.
      """
      encoded = binascii.b2a_base64(s, newline=False)
      if altchars is not None:
          assert len(altchars) == 2, repr(altchars)
          return encoded.translate(bytes.maketrans(b"+/", altchars))
      return encoded
  
imports: import re
  import struct
  import binascii
label_desc: Use image node_id 2 for calling a global function with example usage: b64encode(s, altchars) and returns: encoded, encoded